Pencil



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l Patented Sept-1 1,V 192,5.

,UNITED STATES PATENT o1-=1=llcla'.l.-

` FRANK J'. 'VIERLING AND FRED R. BARTHOLOMEW, OF MINNEAPOLIS,MINNESOTA,

ASSIGNORSTO STERLING- SPECIALTIES MANUFACTURING COMPANY, OF MINNE-APOLIS, MINNESOTA, A CORPORATION OF MINNESOTA.

f, rauen..

Application led September 30, 1920. Serial No. 413,708.

.I To all lwhom it may ciwem:

Be it known that we, FRANK J. VIERLING and FRED R. BARTOLOMEW, arecitizens of the United States, residing at Minneapolis,

.5 in the county of Hennepin and State of Minnesota, have inventedcertain new andl useful Improvements in' Pencils; and we do herebydeclare' the following to be afull, clear, and

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same;

Our invention has for its object to provide an extremely simple and-highly eliicient pencil, and -to this end, the 'invention consi-sts fl5 Vof the novel devices and combinations of devices hereinafterdescribed and defined in the claims.

In the accompanying drawings, which illustrate the invention, likecharacters indi.`

cate like parts throughout the several views.

Referrlng to the drawings:I Fig. 1 is a perspective view of the improvedpencil;

Fig. 2 is a view principally in longitudin 2.5 nal section takencentrally through the pencil on an enlarged scale;

Fig. 3 is a transverse section taken on the line 3-'3 of Fig. 2, on anenlarged scale;

Fig. 4 is a perspective view of the lead feeding mechanism removed fromthe casing, with some parts broken away and sectioned;

Fig. 5 is a perspective view 'of the casing with some parts broken awayand sectioned; Y Fig. 6 is a perspective view of the cap shown in Fig.2;

Fig. 7 is a perspective view of the lead holder shown in Flg. 2;

Fi 8 is a modification of the cap shown 40 in Flg. 6; and

Fig. 9 is a modification of the lead holder shown in Fig. 7

The numeral 10 indicates a cylindrical casing, the lower end of which iscontracted to aiord aint 11. Upper and lower circumferentia internalgrooves ll2 and 13, respectively, are formed in the easing 10 by4pressing the same outward. The upper oove 12 affords a lockg'roove .forthe lead eeding mechanism, as will presently -appear4 l `Afoap tube 14is telescoped part way into the casing 10 and provided with a stop bead-'15 and a lock bead 16, both of which are cirmovement o the cap tube 14into the cas# ing 10, andthe lock .bead 16 is arranged to enter the lockgroove 12 and thereby frictionally secure said cap tube in the cas- 4 fTo permit the lock bead -16 to spring Iinto and out of the lock groove12, 'the cap tube 14 :is lon itudinally spiit or slotted at 17 so thatsai y pushed into or pulled out of the casing 10v and expand when thelock bead 16 isbron ht into alignment with the lock groove 12. bvious byspreading the longitudinal edges of the tube 14 at the slot 17 apart,the frictional engagement of the cap tube 14 with the casing 10 may beincreased at will. The upper portion of thecap 'tube 14 is knurled at 18to afford a finger grip.

' A removable cap 19 has screw-threaded engagement with the -upper endof the cap tube capy tube will contract when" 14 to close the same. Thelower portion of the cap tube 14 is contracted and then extended toaii'ord a sleeve 20 to receive and rigidly hold the upper end of atubular feed screw 21 on which'is mounted a feed nut 22. To prevent thefeed nut 22 from making a complete rotation in the casing 10, but allowaxial travelling movement thereof on the feed screw 21,l there is formedin the casing 10, by pressing the same inward, a longitudinally extendedstop rib 23, see Fig. 3. It is, of course, understood that in some in-`stances, it might be desirable to form a plu= rality of these ribs inthe casing 10- as stops for the feed nut 22.

The feed screw 21 is axially located the casing 10 and its lower end isseated against the internal' tapered' walls of the casing point 11 tohold the4 same against lateral;

the sleeve 20 from the lower, end thereof.

The upper end of the feed screw 21 is'closed and forms g Qlthe cap tube14,

which cap tube affords a compartment X normally closed -by the cap 19for a supply of extral leads.

Mounted for endwise movement in the feed screw 21 is a tubular leadfeeding stem 25 formed, as shown, by folding a single sheet of metal,the upper extremity of which, at the seam, is extended radially outwardto afford a blade 26. This blade 26 extends through the guideslot 24 fortravelling movement therein and is. provided with an intermediate notch27 to receive the feed nut 22 and thereby connect the leadinto said stemto afford a stop 30 to limit the endwise movement of the lead Z into thelead feeding stem 25.

Obviously, by turning the cap tube 14 in the casing 10, the feed screw22 may be turned in either direction to thereby impart an end wisemovement to the lead Z, either to project or retract the same in thevpoint 11. By drawing outward on the cap tube 14 with suiiicient forceto cause the lock bead 15 to cam itself out of the lock groove 12 underthe contraction of the cap tube 14, the entire lead feeding mechanismmay be withdrawn from the casing 10. l

To prevent the blade 26 from striking the upper end of the guide slot 21and thereby bending the same during the receding movement of the leadfeeding stem 25, the lower 'end of the stem 20 is arranged as a stop 20'for-the feed nut 22.

The modified cap 31 shown in Fi 8, is adapted to be screwed into thelead ceding tube 14 the same as the cap 19, and has attached to itsscrew-threaded end an eraser 32. To use the eraser 32, the cap 31 may beunscrewed from lthe cap tube 14, inverted and the top thereof insertedinto said cap tube.` The two circumferential surfaces 433, on top of thecap 31, are of the same diameter andof such size as to tightly t Withinthe casing. 10 and frictionally hold said cap in position while theeraser 32 is being used.

Referring now to the ymodified form of lead holder shown in Fig. 9, thesame is formed from a closed tube 34, and a. notched blade 35, for thefeed nut 22, is formed on the upper end of a rod 36 which is forced intothe tube 34 from the upper end thereof and held in place by friction.The tube 34 notched just below the lower end of the rod 36, to leaveltherebelow a pair of lead l holding 4 jaws 38; holder, the lowerend ofthe rod 36 affords a stop for the lead Z.

It is evident that the-casing 10 shown in detail in Fig. 5 constitutesan outer casing; that the cap tube 14 and tubular feed screw 21 combinedform an inner casing; and that, when the device shown in Fig. 9 isinserted within the tubular portion 21 .of the inner casing, that thedevice then comprises inner and outer telescoped casings, a stemcentrally supported in the inner end of the inner casing and projectingtoward the outer end of the outer casin anda sleeve surrounding the steman projecting beyond the same, the projecting portion ofv saidsleevelforming a lead holder;

What we claim is:

1. A pencil comprising. a casing, a tubef telescoped into the casing andhaving movable frictional engagement therewith, said tube having alongitudinal slot terminating short of its ends which permitscircumferential contraction and expansion of the tube, lead-engagingmeans on the tube, and a circumferential lock groove and a projectionextendingtherein, one of which isY formed in the casing and the other ofwhich is In this form of lead formed in the tube, said lock groove and'projection being located intermediate of 'the ends of the slot in thetube.

2. A pencil comprisinga casing, a tubular feed screw mounted in thecasing and hav.

ing a longitudinal guide slot, a feed nut on .the feed screw, means forholding the feed nut against rotation in the casing but with 4 able withthe other member to limit -telel scopical movement of the two members, astem centrally disposed in the inner member, and a sleeve surroundingsaid stem and having a portion projecting beyond said stem, said sleeveportion forming a lead'holder.

4. A pencil comprising inner and outer telescoping members relativelylongitudinally movable, said inner member having a longitudinal slotterminating short of its ends, a stop on one of said members engageablewith the other member to limit tele-- scopcal movement of the twomembers, a stem centrally disposed in the inner member, and a sleevesurrounding said stem, percasing, and a sleeve surrounding said stemmanently secured thereto and having a porand projecting beyond the same,the protion projecting beyond said stem, said jecting portion of saidsleeve forming a lead sleeve portion forming a lead holder. holder; l

5 5.\A pencil comprising inner and outer In testimony whereof We aHiXour signatelescoping casings relatively longitudinaltures. ly movable, astem centrally supported in the inner end of the inner casing and pro-FRANK J. VIERLING. jectin'gtoward the outer end of the outer FRED R.BARTHOLOMEW.

